This site has a very comprehensive study of the history of Argentina. Right from when there were only nomadic hunter-gatherers, to the presidential elections in 2003, this site mentions many things between that time period.

The CIA World Factbook has several pages for all the countries. For Argentina, there are other links you can click open, and a window has information for things ranging from economy, government, and people's society. It is very general, and for the rough introductory facts about the country.